- I bought this to go with my 70-200 USM II and it is the perfect addition giving me a 400 MM zoom now. Yes, you lose a couple of stops and you can only go down to F5.6 with it on, but its still great and much cheaper than buying a a 400 mm lens. Images fine at full zoom, even cropped in a bit. Autofocus still fast. Well worth it.
- Quite heavy. Doesn't fit all of my lenses though, only the L-Series.
Published on: 11 November 2014